<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>首页</title>
    <link rel="stylesheet" href="../css/sy.css"/>
</head>
<body>
<div class="aa">
    <div class="a a1">
    </div>
    <div class="a a2">
    </div>
    <div class="a a3">
    </div>
</div>

</body>
</html>